Question

e reaction of (R)-2-bromopentane with an excess of sodium 51. Give the SN2product(s) for the reaction of (R)-2-bromopentane w methoxide. A) (S)-2-methoxypentane B) (R)-2-methoxypentane C) (S)-2-ethoxypentane D) (R)-2-ethoxypentane E) (R)-2-pentanol F) (S)-2-pentanol 52. What mechanism predominates in the reaction below? L CH.CH NaOCH, CH,OH A) SN2 B) SNl without rearrangement C) SNI with rearrangement D) E2 E) E1 53. Which of the following is the best method for preparing CH3Br? A) CH3OH + Br B) CH3OH + HBr C) CH3OH + Br2 D) CH3OH + NaBr o E) CH3OH + Br+ 54. Give the major organic product for the following reaction. soal, CH: CH-CH.CH OH CH, CH-CH:CH.CH

Answer 1

CH3 CH3 -OCH + Br - -> - Br Gg Hg M Ha Transition state H3 CH3O- (5)-2-methony pentane

Cz Hi CH₂ H Br (R9-2-bromopentane CH₂ (fischeu foum) (S)-2-methony pentane C₃ Ha 4 - OCH CHA 0 CH3 of this will attack on in anubonding orbital of c-Br bond foum a transition state Inversion configuration occurs. the and of a C Hy CH₂O2 CH H Br